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As a practical matter, Indefinitely. There is people that have used coal they have found in cellars that was easily 50 years old. You could probably let it sit there for thousands if not millions of years.

Anthracite is approximately 300,000,000 years old so chances are you should be good. But if you stack it just right you may run into the trouble of some of it turning into diamonds in a couple hundred million years....

It was in the ground for about 300 million years. However once mined and exposed to the air, it will deteriorate rapidly. My guess is it will not last more than 1-2 hundred million years. Couldn't help myself.

Fred I sent you a couple notes to cheer you up, but that 'dial-up' must be delayed by the bandits who cut the telegraph lines....Are you aware that the Civil war is over out there in the hills? Saddle up 'Silver' and check out the 'Ponderosa'!

Big Hoss is down in Ft Lauderdale at some all night buffet...poppin' 80's so we know where he is, Gingrich is in Alabama and Mississippi, along with the other boys. I'd head due north to get some 'clean air' ! NHRA is in Gainesville, don't know where the circle guys are this weekend....watch out for high speed skiers.....not a good time to go crusin'......keep ole silver between the stone walls and fenced areas.....

When I told my 9 year old daughter the coal in the basement was 300 million years old, her eyes got wide and she said, "wow that must be worth alot of money, you shouldn't waste it by burning it in the furnace!!!"